code: def timeout_time_mp(self):
      while self._parent_process_is_running():
          time.sleep(remote_constants.HEARTBEAT_INTERVAL_S)
  
          cur_time = time.time()
          to_del_client = []
          for (
              client_id,
              last_heartbeat_time,
          ) in self.last_heartbeat_table.items():
              if (
                  cur_time - last_heartbeat_time
                  > remote_constants.HEARTBEAT_RCVTIMEO_S
              ):
                  to_del_client.append(client_id)
          for client_id in to_del_client:
              del self.last_heartbeat_table[client_id]
              self.dead_job_queue.put(client_id)
          self.client_count.value = len(self.last_heartbeat_table)
  
imports: import grpc
  import os
  import time
  import threading
  from concurrent import futures
  from parl.remote import remote_constants
  from parl.remote.grpc_heartbeat import heartbeat_pb2
  from parl.remote.grpc_heartbeat import heartbeat_pb2_grpc
  from parl.utils import logger, get_ip_address
  import psutil
  import multiprocessing
label_desc: Use image node_id 6 for calling the GrpcHeartbeatServer obj's underlying member method code with example usage: obj.timeout_time_mp() without return types